package com.transer.web.servlet;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.Random;

import javax.imageio.ImageIO;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.transer.constant.Constants;

/**
 * Servlet implementation class AuthCodeServlet
 * 
 * @author Administrator
 * 
 * @version 1.0 ywengineer@gmail.com
 * 
 */
public final class AuthCodeServlet extends ActionSupport {
	private static final long serialVersionUID = 1L;

	private static final int IMG_WIDTH = 68;

	private static final int IMG_HEIGHT = 22;

	/*
	 * (non-Javadoc)
	 * 
	 * @see com.opensymphony.xwork2.ActionSupport#execute()
	 */
	@Override
	public String execute() throws Exception {
		BufferedImage img = new BufferedImage(IMG_WIDTH, IMG_HEIGHT, BufferedImage.TYPE_INT_RGB);

		// 得到该图片的绘图对象

		Graphics g = img.getGraphics();

		Random r = new Random();

		Color c = new Color(200, 150, 255);

		g.setColor(c);

		// 填充整个图片的颜色

		g.fillRect(0, 0, 68, 22);

		// 向图片中输出数字和字母

		StringBuffer sb = new StringBuffer();

		char[] ch = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".toCharArray();

		int index, len = ch.length;

		for (int i = 0; i < 4; i++) {

			index = r.nextInt(len);

			g.setColor(new Color(r.nextInt(88), r.nextInt(188), r.nextInt(255)));

			g.setFont(new Font("Arial", Font.BOLD | Font.ITALIC, 22));// 输出的字体和大小

			g.drawString("" + ch[index], (i * 15) + 3, 18);// 写什么数字，在图片的什么位置画

			sb.append(ch[index]);
		}

		ActionContext.getContext().getSession().put(Constants.SESSION_AUTH_CODE, sb.toString());

		ImageIO.write(img, "JPG", ServletActionContext.getResponse().getOutputStream());

		return null;
	}
}
